The Gas Tax Has Been Fixed at 18 Cents for Two Decades. Now Would Be a Great Time to Raise It

Why One-Off Federal Investments Won’t Make or Break US Critical Mineral Supply

Recent federal actions to support the burgeoning US critical minerals industry lack a clear strategy to address national security and short-term priorities.

Grist: “The Year the US Doubled Down on Critical Minerals”

RFF Fellow Beia Spiller comments on the federal government’s use of equity stakes to bolster the domestic critical minerals industry.

2026 Transportation Engineering, Economics, and Policy Workshop

An RFF workshop highlighting new research to address pressing policy questions related to electric vehicles, traffic congestion, and e-mobility.

Contrails, Aviation, and Climate Change

This issue brief explores how contrails are formed from the combustion of jet fuel, how contrails effect the climate, and what can be done to reduce them.